250results about "Needle severing devices" patented technology

This invention provides a single-action anti-bird nest thread-cutting mechanism and its control method. The single-action anti-bird nest thread-cutting mechanism includes a fixed blade, a rotatable movable blade, a thread-cutting drive source, and a thread-cutting drive assembly. The fixed blade has a fixed blade edge. The thread-cutting drive source is connected to the movable blade via the thread-cutting drive assembly, driving the movable blade to rotate towards or away from the fixed blade. The movable blade has a starting thread hook groove and a separating thread hook groove. The starting thread hook groove allows the sewing machine needle to pass through. The movable blade has a moving blade edge on its surface facing the fixed blade. The starting thread hook groove and the separating thread hook groove are distributed on the same side of the moving blade edge. This application uses the same thread-cutting drive source and the same set of movable and fixed blades to achieve the purpose of preventing bird nests during the starting thread cutting and automatic thread cutting after sewing, effectively avoiding thread breakage during the starting thread and achieving a stable effect of normal starting thread without bird nest clumps.

The utility model provides a thread trimming structure of a sewing machine, and belongs to the technical field of sewing machines. The problems that an existing thread trimming structure is insufficient in working reliability and short in service life are solved. The thread trimming structure of the sewing machine comprises a thread pressing piece, an auxiliary cutter arranged on a machine base and a movable cutter which is located below a needle plate and can vertically swing around a rotating shuttle shaft of the sewing machine, the auxiliary cutter is provided with a thread trimming end with an auxiliary cutter edge, a thread hooking groove is formed in the movable cutter, and a movable cutter edge is formed in the upper edge of the thread hooking groove. When the movable cutter swings upwards, the thread hooking groove can directly face the needle falling hole up and down, when the movable cutter swings downwards, the cutting edge of the movable cutter can be meshed with the cutting edge of the auxiliary cutting edge, the thread pressing piece is movably connected to the upper side face of the movable cutter, and the movable cutter is further provided with a reset spring acting on the thread pressing piece. And when the auxiliary knife edge is meshed with the movable knife edge, the thread trimming end of the auxiliary knife can abut against the lower side face of the thread pressing piece. The working reliability and the service life of the thread trimming structure can be improved.

The invention discloses an upper thread sewing starting processing device and a sewing machine, and relates to the technical field of sewing machines, a needle plate assembly of the upper thread sewing starting processing device is provided with a needle plate hole, a thread grabbing plate and a thread clamping plate are movably assembled on the needle plate assembly, a thread trimmer is fixedly assembled on the needle plate assembly, the thread grabbing plate is provided with a thread grabbing hole, and the thread clamping plate is provided with a thread clamping head. The driving assembly is connected with the wire grabbing plate and the wire clamping plate and used for controlling the wire grabbing plate and the wire clamping plate to move. Wherein the moving route of the wire grabbing plate is a first route, and the moving route of the wire clamping plate is a second route; when the thread grabbing plate is located at the head end of the first route, the upper thread penetrates through the needle plate hole and the thread grabbing hole, and when the thread grabbing plate moves to the tail end from the head end of the first route, the upper thread is clamped by the thread clamping head and then cut off by the thread trimmer; when the thread clamping plate is located at the tail end of the second line, the thread clamping head loosens the upper thread. According to the upper thread sewing starting processing device, the upper thread can be clamped, cut off and loosened in one-time movement in the sewing starting stage, the movement process is simplified, and the sewing quality is improved.

The utility model relates to the technical field of bag sewing, and provides an automatic sewing machine for a zipper box, which is used for solving the problem of unsafety of manual flanging operation and comprises a rack, an operation table top is arranged on the rack, a sewing machine is arranged on the operation table top, and a sewing guide block is arranged on a machine base of the sewing machine. The sewing guide block is detachably arranged on a machine base of the sewing machine, a positioning protrusion is arranged at the position, located below a needle head of the sewing machine, of the sewing guide block in an upward protruding mode, a sewing channel is vertically formed in the positioning protrusion in a penetrating mode, and the front end face and the rear end face of the positioning protrusion are arc-shaped faces adapting to corners of an external extrusion frame. A flanging block is arranged on the side, close to the inner side face of the sewing machine body, of the sewing guide block, an arc-shaped turning face is arranged on the outer side face of the flanging block, a sewing opening is formed in the flanging block in an up-down penetrating mode, and a first driving structure is arranged on the rack.

The utility model belongs to the technical field of sewing machine technologies, and relates to an anti-interference type multi-light-eye correlation structure and a sewing machine thereof, a thread trimming switch assembly is arranged on a machine head of the sewing machine, and a thread trimmer assembly is arranged in a machine shell. A plurality of light eyes electrically connected with an electric control module of the sewing machine are sequentially arranged in the cloth feeding direction of the sewing machine, and emitters and inductors of the light eyes are arranged on the machine shell and the thread trimming switch assembly respectively to form an up-down correlation structure. Wherein the inductor of at least one light eye is arranged on the thread trimming switch assembly, and the inductor of the adjacent light eye is arranged on the machine shell. According to the anti-interference type multi-light-eye correlation structure and the sewing machine with the anti-interference type multi-light-eye correlation structure, the effects of accurate control and short thread ends can be achieved.

The utility model relates to the technical field of sewing equipment, in particular to an improved thread trimming mechanism of a sewing machine, which comprises a thread trimming structure, and the thread trimming structure comprises a movable cutter unit and a fixed cutter matched with the movable cutter unit for use; the movable cutter unit comprises a driving part, an annular supporting seat, a mounting part integrally formed with the annular supporting seat and a cutter, the cutter is mounted on the mounting part through a fastener, a first blade part is arranged on the cutter, and a second blade part meshed with the first blade part is arranged on the fixed cutter; the driving piece drives the annular supporting base to rotate so as to drive the first blade part of the cutter to approach the second blade part of the fixed cutter to cut off the thread residues. According to the thread trimming structure, the complex structure of a traditional thread trimming mechanism is simplified, and the manufacturing and maintenance cost is reduced. Meanwhile, the conveying mechanism is composed of a first gear, a second gear and a conveying belt, belt conveying transmits power through friction or synchronous gear meshing, instant impact force can be effectively reduced, and the problems of vibration and noise caused by rigid transmission are solved.

The utility model provides a flat cutter thread trimming mechanism of a sewing machine and belongs to the technical field of sewing machines. The problem that an existing flat cutter thread trimming device is high in maintenance cost is solved. The flat cutter thread trimming mechanism of the sewing machine comprises a fixing frame, a rotating shaft vertically arranged on the fixing frame in a penetrating mode, a fixed cutter horizontally fixed to the fixing frame, a movable cutter connected to the fixing frame in a horizontal swinging mode and a movable handle arranged outside the rotating shaft in a sleeving mode and capable of rotating around the axis of the rotating shaft. The flat cutter thread trimming mechanism of the sewing machine further comprises a driving motor, a long-strip-shaped swing rod and a long-strip-shaped driving rod, an output shaft of the driving motor is vertically arranged, the swing rod and the driving rod are horizontally arranged, one end of the swing rod is fixed to the output shaft, and the other end of the swing rod is hinged to one end of the driving rod. And the other end of the driving rod is hinged with the other end of the movable handle. The flat cutter thread trimming mechanism of the sewing machine has the advantage of low maintenance cost.

The utility model relates to the technical field of sewing machines, in particular to a thread trimming mechanism of a sewing machine, which comprises a fixing frame, a top plate is mounted on the top surface of the fixing frame, a supporting plate is mounted on the upper surface of the top plate, and a motor body is mounted on the right side surface of the supporting plate. The output end of the motor body penetrates through the interior of the supporting plate to be provided with a rotating disc, and a connecting block is installed on the back face of the rotating disc. A sewing thread can be trimmed through the blade body, after the trimming operation is finished, the motor body is closed, then the telescopic rod is started, and the abutting block is driven to move towards the back face through the telescopic rod, so that the protruding part of the sewing thread can be clamped, follow-up use of the sewing thread is facilitated, and after the whole sewing thread is stable, the motor body is closed. At the moment, the motor body is started, the connecting plate and the blade body are restored to original positions, and therefore the operation effect is good during overall thread trimming.

The invention discloses an automatic thread-trimming and thread-loosening-preventing mechanism for a sewing machine, which adopts an integrated structure that a cam is driven by a single motor, adopts a single power source to synchronously control thread-trimming and thread-clamping actions, replaces a traditional electromagnet system and has a sewing-starting and thread-loosening-preventing function. In the invention, the thread loosening end and the presser foot lifting end of the cam are independently designed in a layered manner, so that compact integration of mechanical transmission is realized, the size of a machine head is obviously reduced, and after an electromagnet control scheme is replaced, the defects of high noise, easiness in heating and the like can be overcome; in addition, a thread clamping action is supplemented for a conventional sewing process, the motor controls the thread clamping assembly to clamp a free-state thread end after the thread cutting action is completed, it is ensured that the next sewing starting action can accurately complete the thread hooking action, and the phenomena of thread loosening and thread flying are prevented.

The invention provides a lower thread cutting device of a flat chain seam sewing machine. According to the utility model, the problem that the operator is difficult to understand and inconvenient due to the difference that whether the tension applied to the thread by the thread trapper can be released or not by operating the pedal and operating the presser foot lifting rod due to the presence or absence of the lower thread cutting device can be solved. The lower thread cutting device is provided with a lower thread cutting operation mechanism (5) which enables the thread loosening mechanism (4) and the lower thread cutting mechanism (3) to operate, and a presser foot lifting operation mechanism (6) which does not enable the lower thread cutting mechanism (3) to operate and enables the thread loosening mechanism (4) and the presser foot lifting mechanism (2) to operate. Therefore, the force of the thread trapper (11) can be released by operating the pedal plate with a foot regardless of the presence or absence of the off-line cutting device.

The utility model relates to clothing machinery, in particular to a clothing lower hem thread trimming device free of manual trimming, which comprises a lower thread trimming unit mounted below a needle plate surface of a sewing machine and an upper thread trimming unit mounted on a machine body of the sewing machine. The upper trimming unit and the lower trimming unit are provided with the same suction and shearing integrated module, the upper trimming unit can move downwards and be close to the needle plate face, and the upper trimming unit and the lower trimming unit attract and shear thread ends on upper threads and bottom threads of clothes pieces respectively. The device has remarkable advantages in the aspects of improving the production efficiency, reducing the cost, improving the product quality and the like, and is an ideal choice for automatic upgrading of the clothing manufacturing industry.

The utility model relates to sewing machine equipment, and discloses an electromagnetic trimming noise reduction mechanism and a sewing machine thereof, the electromagnetic trimming noise reduction mechanism comprises an electromagnet (11) installed on a base (10), a trimming driving shaft (12) and a trimming crank (13), the trimming driving shaft (12) penetrates through the trimming crank (13) to be connected with the electromagnet (11), one end of the trimming driving shaft (12) is sleeved with a first elastic element (14), and the other end of the trimming driving shaft (12) is sleeved with a second elastic element (14). The first elastic element (14) is arranged between the thread trimming crank (13) and the electromagnet (11); and a buffer pad (15) is fixed at the end part of the tangent driving shaft (12) and is in contact connection with an ejector rod of the electromagnet (11). The output force of an electromagnet is too large, electric control parameters are not easy to adjust, loud sound is generated when the electromagnet pushes a tangent driving shaft, and the using effect is affected. The first elastic element and the buffer pad are installed at the end of the thread cutting driving shaft on the mechanism, so that the sound generated when the electromagnet ejector rod impacts the thread cutting driving shaft is greatly reduced.

The utility model discloses a sewing machine trimming device for school uniform production, which comprises a base, a sewing machine main body is fixedly connected to the rear part of the top of the base, a limiting chute is arranged on the surface of the base close to the edge of the side surface, a micro motor is arranged in the limiting chute, a screw rod is arranged at the end part of the micro motor, and the screw rod is connected with the sewing machine main body. A guide block is arranged outside the lead screw in a sleeving manner, pneumatic scissors are movably mounted at the top of the guide block, extension plates are fixedly connected to the two sides of the pneumatic scissors, positioning holes are formed in the surfaces of the extension plates and the guide block, and positioning pins are inserted into the positioning holes. The pneumatic scissors are installed on the guide block, the guide block moves on the base in the horizontal direction under the action that the micro motor drives the lead screw, the use position of the pneumatic scissors can be adjusted, threads at different positions can be cut off conveniently, the pneumatic scissors and the guide block are connected through the positioning pin, and disassembly and assembly are easy and convenient.

The present application belongs to the technical field of sewing machines, and relates to a thread catching and air suction device of a sewing machine, which comprises: a rotating hook arranged below a bottom plate of the sewing machine and driven by a lower shaft to rotate along a first circumferential direction about an axis thereof; a thread cutting assembly comprising a fixed blade and a movable blade, the fixed blade being fixed below the bottom plate, the movable blade being in an arc-shaped plate structure, the arc shape of the movable blade being arranged at a distance from and surrounding an outer periphery of the rotating hook, the movable blade being rotatable from a sewing position to a thread cutting position along a second circumferential direction; a thread catching assembly comprising an arc-shaped thread catching plate, the arc shape of the thread catching plate being arranged at a distance from and surrounding the outer periphery of the rotating hook, an end of the thread catching plate being provided with a thread catching hole, the thread catching plate being rotatable from the sewing position to a thread catching position along the second circumferential direction; and an air suction assembly comprising an air suction pipe connected with a negative pressure device. The thread catching and air suction device of the sewing machine provided by the present application can solve the bird nest problem of the sewing machine, and has excellent high-speed adaptability and high motion precision.

The invention provides an anti-nest thread trimming device and method and a sewing machine, and relates to the technical field of sewing machines, the anti-nest thread trimming device comprises a machine needle and a driving cutter, the driving cutter is arranged below a sewing material, and the machine needle is movably arranged between the upper portion and the lower portion of the sewing material; the driving cutter is provided with a thread passing hole, a first cutting edge and a first thread clamping part; the driving cutter is provided with a first position for the machine needle to penetrate through the thread passing hole to conduct first needle sewing and a second position for the machine needle and the driving cutter to be staggered to conduct follow-up sewing. The auxiliary moving cutter is provided with a second cutting edge; after first needle sewing is completed, the machine needle moves to the side, away from the thread passing hole, of the sewing material, and the first thread clamping part and the side, provided with the second blade, of the auxiliary movable cutter clamp the upper thread; after at least second needle sewing is completed, the auxiliary moving cutter moves to the position where the second cutting edge is in butt joint with the first cutting edge so as to cut off the upper thread. By means of the technical scheme, the problem that nest-shaped thread ends are likely to be generated in the thread trimming process of a sewing machine in the prior art can be effectively solved.

The utility model belongs to the technical field of sewing machines, and particularly relates to a straight knife type thread trimming mechanism and a template machine. The straight knife type thread trimming mechanism comprises a machine shell, a first movable knife mechanism and a second movable knife mechanism; the first movable cutter is rotatably arranged on the machine shell by taking the rotating shuttle shaft as the center; the first trimming motor is fixed to the machine shell and used for driving the first movable cutter. The first movable cutter is used for driving the sewing thread to the second movable cutter mechanism; the second movable cutter mechanism is used for being matched with the first movable cutter mechanism to cut off the sewing thread and comprises a second thread cutting motor, a second movable cutter and a guide assembly; the second trimming motor drives the guide assembly to move in the set direction through the crank assembly. The second moving cutter is installed on the guide assembly and has a first position and a second position in the set direction. The first position is closer to the first moving cutter than the second position; when in the first position, the cutting edge of the second movable cutter is matched with the cutting edge of the first movable cutter to execute thread trimming action; at the second position, the cutting edge is separated from the first movable cutter, so that the thread trimming action is efficient and reliable, and maintenance is convenient.

The utility model discloses a sewing machine thread trimming device with adjustable thread end length, which relates to the field of sewing machines and comprises a spindle, a concentric first mounting shaft section is arranged on the outer end face of the spindle, a concentric second mounting shaft section is arranged on the outer end face of the first mounting shaft section, and the diameter of the second mounting shaft section is smaller than that of the first mounting shaft section. The first mounting shaft section is rotatably connected with a first driving device, the first driving device is fixedly connected with a main cutter device, the second mounting shaft section is rotatably connected with a second driving device, the second driving device is fixedly connected with an auxiliary cutter device, and the outer end face of the first mounting shaft section is rotatably connected with an intermediate gear which is coaxial with the first mounting shaft section; the intermediate gear is located between the first driving device and the second driving device, the intermediate gear is in transmission connection with the first driving device and the second driving device at the same time, the first driving device, the intermediate gear and the second driving device form a planetary gear structure, the structure is simple and reliable, and the length of a thread end can be conveniently adjusted.

This invention relates to a movable thread cutter with a sweeping function, a thread cutting mechanism, and a sewing machine for thread cutting operations in a sewing machine. The movable thread cutter has a thread separating tip for insertion into a thread loop. The right side of the thread separating tip has a thread separating side. The movable thread cutter can move relative to the thread cutter until the two engage to cut the thread or separate. The thread separating tip also has a sweeping structure, which includes a sweeping hole and a sweeping opening connecting the sweeping hole and the thread separating side. The sweeping hole forms a sweeping stop on at least one side of the sweeping opening.

The utility model provides a sewing machine with needle spacing adjustment and positioning swing seat zero position, specifically relates to sewing machine manufacturing technical field. Including drive source and swing seat zero position positioning mechanism, its characterized in be, drive source drives the slider on the output shaft indirectly to swing seat and executes swing seat zero position positioning. The utility model discloses a sewing machine with needle spacing adjustment and positioning swing seat zero position has the characteristics of high precision of positioning swing seat zero point position compared with prior art, and the static positioning wheel is fixed with the adjusting dynamic wheel, makes the operation more stable, the clearance of each component is smaller after positioning, the mechanical wear degree of each component is smaller, and the noise is relatively lower, has the advantages of stable operation, the drive source of the utility model preferably uses the step motor or servo motor, so that the drive source can be smoothly realized under the intelligent control program of sewing machine, has higher popularization and use value.

This invention discloses a fully automatic winding device, including a mounting plate and a winding module, a clamping module, and a cutting module disposed on the mounting plate. The winding module includes a rotating shaft, a shuttle taker, and a winding rotation mechanism. The clamping module includes a ring bracket, a clamping device, and a clamping revolution mechanism. The cutting module includes a cutter and a cutting movement mechanism. The cutter includes a cutting platform and a cutter head. The cutting edge of the cutter head faces the opposite direction to the revolution of the clamping device. When the cutter moves closer to the rotating shaft, the cutter head is located within the inner circumference of the clamping device's revolution. When the cutter moves away from the rotating shaft, the cutter head is located outside the outer circumference of the clamping device's revolution. The clamping device has a cutting platform on its inner side and a clamping opening on its outer side. When the cutter moves closer to the rotating shaft and the clamping device revolutionizes to the side facing the cutter, the cutter head engages with the cutting platform. This fully automatic winding device can automatically complete the hooking and winding of the bobbin. The present invention also discloses a winding method.

The utility model belongs to the technical field of button sewing machines, and relates to a structure capable of trimming a thread first and then lifting a presser foot for a button sewing machine, which comprises a rack, a thread trimming device and a presser foot lifting device, a driving motor is arranged on the rack, a driving wheel is fixed on a rotating shaft of the driving motor, and the driving wheel is connected with the thread trimming device and the presser foot lifting device. The thread trimming device and the presser foot lifting device are movably connected with the driving wheel through the starting plate, the driving wheel rotates to sequentially drive the thread trimming device and the presser foot lifting device, a thread trimming groove and a presser foot lifting groove are formed in the starting plate and communicate with each other, and the thread trimming device and the presser foot lifting device are arranged on the starting plate. And the driving wheel is provided with a rolling shaft which is matched with the thread trimming groove and the presser foot lifting groove for use. The utility model aims to provide the structure which is used for the button sewing machine, can solve the problem of complex structure, and is short in thread end after thread trimming.

The utility model relates to the technical field of glove covering machines, in particular to a scissors device of a glove covering machine, which comprises a fixing plate, a fixing block, a limit strip and a connecting rod, a guide rail is arranged on the front side of the fixing plate, a driven rod is slidably connected onto the guide rail, and a rotating block is rotatably connected onto the outer side of the driven rod. An electric rotating shaft is fixedly connected to the inner side of the rotating block, the fixed end of the electric rotating shaft is fixedly connected with the fixed plate, a connecting rod is rotatably connected to the end, away from the guide rail, of the driven rod, a connecting block is fixedly connected to the other end of the connecting rod, and a traction block is fixedly connected to the lower side of the connecting block; a metal block is fixedly connected to one side of the traction block, a supporting column is fixedly connected to the upper side of the limiting strip, and a cutting block is fixedly connected to the top end of the supporting column. According to the glove edge covering line shearing device, through the arrangement of the driven rod, the rotating block and the connecting rod, the efficiency and accuracy of glove edge covering line shearing are remarkably improved, and the requirement for manual operation is reduced.

This invention relates to the field of collection device technology, and more particularly to an automatic thread cutting and collection device for a sewing machine. The device includes a base plate and a servo cylinder. A pushing component is installed at the rear end of the servo cylinder, a supporting and limiting component is installed on the outside of the pushing component, a thread guide component is installed on the inside of the pushing component, a cutting component is installed at the rear end of the thread guide component, an air blowing component is installed at the upper end of the base plate, and a thread guiding component is installed at the bottom end of the thread guide component. The pushing component includes a movable cylinder with a movable hole and a first limiting groove on its inner side. The thread guide component includes a cylindrical shell with a thread passage on its inner side, and a thread inlet hole and a conical groove near the rear end of the cylindrical shell. In this invention, the device can effectively improve the problem of thread length fluctuation during thread cutting in a sewing machine, keeping the thread in a straight and taut state, accurately controlling the thread cutting length, improving cutting consistency, optimizing the appearance of the sewn part, and ensuring processing quality. Simultaneously, the operator does not need to cut the thread, thus increasing the sewing speed.

The application discloses a thread clamping and cutting device and a sewing machine, which comprises a mounting seat, a sliding plate, a thread clamping plate, a thread cutting plate, a transmission plate and a driving rod. The mounting seat is fixed to the sewing machine and located below a needle plate. The sliding plate is movably connected to the mounting seat. The thread clamping plate is installed on the sliding plate. The thread cutting plate is installed on the sliding plate. The transmission plate is connected with the thread clamping plate and the thread cutting plate. The driving rod is connected with the transmission plate. The driving rod drives the transmission plate to move. In the process that the driving rod moves from the first end to the second end of the stroke, the thread clamping plate, the thread cutting plate and the sliding plate are sequentially driven to move to realize the actions of clamping the sewing thread, cutting the sewing thread and moving the sliding plate from the initial position to the avoiding position in the moving direction of the driving rod. By sequentially clamping and cutting the sewing thread, the stability of the sewing hooking thread can be ensured, so that the occurrence of the bird nest is reduced. After the thread is cut, the sliding plate moves to the avoiding position to avoid the interference caused by the moving cutter below the needle plate.

The utility model relates to an electric thread trimming device of a quilting machine. The electric thread trimming device comprises a movable base, the surface of the movable base is provided with an electric thread cutting mechanism for quickly cutting off a thread rope on the quilting machine; when thread trimming is needed, an air cylinder is started to drive a push block to move, the push block drives a connecting seat to swing, so that a rotating ring is driven to rotate through the connecting seat, the movable cutter on the surface of the rotating ring moves to be attached to a fixed cutter, and the thread is trimmed. The adjusting knob can be rotated by a tool to drive the adjusting rod to rotate, and the surface of the adjusting rod and the interior of the adjusting table are in threaded installation, so that position adjustment of the fixed cutter on the adjusting table is controlled, the adjusting range is enlarged, and when the fixed cutter is replaced, the limiting bolt is rotated to be separated from the adjusting table; therefore, the fixed cutter is taken out and is convenient to replace.

The present invention comprises: a needle; a needle plate that supports a fabric from below and has a needle drop through which the vertically moving needle penetrates; a looper that reciprocates below the needle plate while holding a looper thread so as to intertwine the looper thread with a needle thread; and a knife part that moves between the needle plate and the looper, and cuts the needle thread and the looper thread connected to the fabric after sewing. The knife part can change, with respect to the needle plate, a cutting position at which the needle thread and the looper thread are cut. Between the needle plate and the looper, a space in which the knife part in a posture before cutting in the position changed state can be disposed is secured.

The utility model discloses a trimming mechanism of a sewing machine, which relates to the technical field of sewing machines and comprises a movable mounting plate, a motor connected to one side of the top end of the movable mounting plate, a turntable connected to the output end of the motor, a fixed column connected to the outer wall of one side of the turntable, and a guide slide rail slidably connected to the outer wall of the fixed column. The outer wall of one side of the guide sliding rail is connected with a push rod, the end, away from the guide sliding rail, of the push rod is rotationally connected with a first connecting rod, the outer wall of one side of the first connecting rod is provided with a first sliding groove, and the end, away from the push rod, of the first sliding groove is slidably connected with a second connecting rod. According to the sewing thread cutting device, the cutting length can be controlled by rotating the threaded rod for adjustment, sewing threads with different lengths are possibly needed for different styles and specifications, the shearing assembly is adjusted to the corresponding position according to the specific production requirement, it is ensured that the length of the sewing threads cut off each time meets the requirement, and the production flexibility is improved.

The utility model belongs to the technical field of sewing machines, and particularly relates to a flat seaming machine. Comprising a rotary driving part, a presser foot lifting driving assembly, a thread trimming driving assembly and a stitch length adjusting driving assembly, the rotary driving part comprises a rotary part, and a presser foot lifting cam, a thread trimming cam and a stitch length adjusting cam are arranged on the rotary part; the presser foot lifting cam, the thread trimming cam and the stitch length adjusting cam respectively drive the presser foot lifting driving assembly, the thread trimming driving assembly and the stitch length adjusting driving assembly to execute presser foot lifting, thread trimming and stitch length adjusting actions without mutual interference; according to the utility model, the rotary driving piece is combined with the position relation of the stitch length adjusting cam, the thread trimming cam and the presser foot lifting cam, so that the execution of stitch length adjusting, thread trimming, thread loosening and presser foot lifting actions is realized without mutual interference, the structure is compact and simplified, the number of parts is reduced, and the part cost is reduced.

The utility model provides a driving mechanism for presser foot lifting and thread trimming of a sewing machine, and belongs to the technical field of sewing machines. The problem that two drivers are needed for presser foot lifting and thread trimming in the prior art is solved. The driving mechanism comprises a double-head motor, a lifting and pressing cam fixedly connected to one end of an output shaft of the double-head motor, a thread trimming cam fixedly connected to the other end of the output shaft of the double-head motor, a lifting and pressing swing rod, a lifting and pressing ejector rod, a thread trimming swing rod and a thread trimming pull rod, one end of the lifting and pressing swing rod is hinged to the machine body, and the other end of the lifting and pressing swing rod is connected with the presser foot lifting mechanism through the lifting and pressing ejector rod. The other end of the lifting and pressing swing rod is further provided with a pin roller, the pin roller abuts against the peripheral wall of the lifting and pressing cam, a concave cam groove is formed in the outer side of the thread trimming cam, one end of the thread trimming swing rod is hinged to the machine body, the other end of the thread trimming swing rod is connected with the thread trimming mechanism through a thread trimming pull rod, and a rolling sleeve is arranged on the thread trimming pull rod and embedded into the cam groove. The driving mechanism for lifting the presser foot and trimming the thread of the sewing machine has the advantages of compact structure and low cost.

The utility model relates to the technical field of sewing machines, in particular to a thread trimming mechanism of a sewing machine. A movable knife is fixedly connected to a movable knife rest, the movable knife rest is rotatably arranged on a lower shaft in a sleeving mode, the movable knife rest is hinged to a connecting rod, the connecting rod is hinged to a crank, the crank is fixed to an output shaft, the output shaft is connected with a thread trimming driver, and the thread trimming driver outputs power to drive the output shaft to rotate. The rotating shuttle is provided with a thread hooking hook, the movable cutter is provided with a thread hooking part and a thread trimming part, the thread hooking hook is located on the outer side of the thread hooking part, and the thread trimming part is located behind the thread hooking part. The working efficiency is improved, the sewn stitch is attractive, and the sewing quality is improved.